Eagle H-Beam 4340 Forged Chromoly Steel Connecting Rods are manufacturered from a two-piece forging process. This process forces the grain into the shape of a connecting rod, resulting in a superior fatigue life. The rod cap is forged separately so that the grain runs perpendicular to the load forces, which strengthens the rod. Eagle include a higher content of nickel & chrome, which increases the strength & fatigue life without making the rod brittle. Every Eagle rod is multi-stage heat treated and includes ARP 2000 5/16" bolts which can handle up to 230,000psi. The silicon bronze bushings are inserted for floating piston pin. Each rod set is packaged in weight matched sets end to end /-1 gram! Every rod is shot peened to stress relieve the metal. Eagle x-rays, sonic tests and magnafluxs each rod to insure quality. Eagle rods are ready to run, installation instructions & bolt lubricant are included.